Self-adaptive setting method for protection parameters of intelligent measurement switch in low-voltage transformer area

Abstract

The invention discloses a self-adaptive setting method for intelligent measurement switch protection parameters of a low-voltage transformer area, and relates to the technical field of distribution automation of the low-voltage transformer area, and the method comprises the following steps: constructing a transformer-box-meter relation of the low-voltage transformer area; the rated incoming line total current of the jth metering box on the ith phase line is calculated based on the transformer-box-meter relation, and the overload long time delay setting value of the intelligent measurement switch of the jth metering box on the ith phase line is calculated based on the rated incoming line total current of the jth metering box on the ith phase line; calculating the total line impedance of the intelligent measurement switch of the jth metering box on the ith phase line; and calculating a short-circuit instantaneous setting value and a short-circuit short-delay setting value of the intelligent measurement switch of the jth metering box on the ith phase line based on the line total impedance of the intelligent measurement switch of the jth metering box on the ith phase line. According to the invention, remote on-line automatic setting of protection parameters can be realized, so that the manual on-site setting cost is reduced, and the operation and maintenance efficiency of a power grid and the power utilization safety of a user are improved.

Description

Technical Field

[0001] This invention relates to the field of low-voltage distribution automation technology, and more specifically to an adaptive setting method for the protection parameters of intelligent measuring switches in low-voltage distribution areas. Background Technology

[0002] Currently, the intelligent measurement switch for low-voltage distribution areas has the hardware capabilities for remote communication and basic configuration, and can support the remote setting and adjustment of protection parameters. However, existing technologies still have three major problems in practical applications: the lack of remote setting capability, the lack of adaptive protection parameters, and insufficient setting accuracy. As a result, protection parameters still rely on manual on-site configuration, making it difficult to ensure the accurate operation of intelligent measurement switches in fault conditions. Therefore, how to provide an adaptive setting method for the protection parameters of intelligent measuring switches in low-voltage distribution areas, which can realize remote online automatic setting of protection parameters, thereby reducing the cost of manual setting, improving the efficiency of power grid operation and maintenance and the safety of users' electricity use, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide an adaptive tuning method for the protection parameters of intelligent measuring switches in low-voltage distribution areas.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An adaptive setting method for the protection parameters of a low-voltage distribution area intelligent measuring switch includes the following steps: Establish the transformer-box-meter relationship for the low-voltage distribution area; Calculate the rated total incoming current of the j-th metering box on the i-th phase line based on the aforementioned transformer-box-meter relationship, where i = A, B, C; j = 1, 2, ..., J. i J i This represents the total number of energy meters connected to the i-th phase line; Calculate the overload long-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line based on the rated total incoming current of the j-th metering box on the i-th phase line. Calculate the total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; Calculate the short-circuit instantaneous setting value and short-circuit short-delay setting value of the intelligent measuring switch of the j-th metering box on the i-th phase line based on the total line impedance.

[0005] Preferably, the transformer-box-meter relationship for the low-voltage distribution area is constructed based on the following steps: Obtain voltage curve data from the low-voltage distribution area master meter, individual user energy meters, and individual smart metering switches; The voltage curve data of the master meter and the voltage curve data of each smart metering switch are clustered using the adaptive density peak clustering method to obtain the transformer-box relationship of the low voltage distribution area. The transformer-box relationship of the low-voltage substation area is tested and corrected using the adaptive k-nearest neighbor anomaly test method to obtain the corrected transformer-box relationship of the low-voltage substation area. The voltage curve data of the main meter and the voltage curve data of each user's electricity meter are clustered using the adaptive density peak clustering method to obtain the household-transformer relationship in the low-voltage distribution area. The household-transformer relationship in the low-voltage distribution area is tested and corrected using the adaptive k-nearest neighbor anomaly test method to obtain the corrected household-transformer relationship in the low-voltage distribution area. By integrating the corrected transformer-box relationship and the corrected household-transformer relationship of the low-voltage distribution area, the transformer-box-meter relationship of the low-voltage distribution area is obtained.

[0006] Preferably, the rated total incoming current of the j-th metering box on the i-th phase line is obtained based on the following formula: ; In the formula, I N I represents the rated total incoming current of the j-th metering box on the i-th phase line; n N represents the rated current of the user's energy meter in the j-th metering box on the i-th phase line; N represents the number of user's energy meters in the j-th metering box on the i-th phase line; K represents the load simultaneity factor corresponding to N.

[0007] Preferably, the overload long-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line is obtained based on the following steps: Determine the rated current range [I] min ,I max ]make Among them, [I] min ,I max = [63A, 80A], [80A, 100A], [100A, 125A], [125A, 160A], [160A, 250A], [250A, 315A], [315A, 400A], [400A, 500A], [500A, 630A], [630A, 700A] or [700A, 800A]; Rated current I min Rated current I max All of these indicate the rated current specification of the intelligent measuring switch; The rated current I max The overload long delay setting value is set to the intelligent measurement switch of the j-th metering box on the i-th phase line.

[0008] Preferably, the total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line is obtained based on the following steps: Establish the voltage loop equations for the intelligent measuring switch of the j-th metering box on the i-th phase line: The voltage loop equations are fitted using a multivariate constrained linear regression analysis method to obtain the main line impedance and branch line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line. The total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line is obtained based on the main line impedance and branch line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line.

[0009] Preferably, the expression for the voltage loop equations is: ; In the formula, , ,..., In order to represent time, time,..., The voltage of the i-th phase line of the distribution transformer at any given moment; , ,..., In order to represent time, time,..., The voltage of the intelligent measuring switch of the j-th metering box on the i-th phase line at time t; , ,..., In order to represent time, time,..., The main line current of the intelligent measuring switch of the j-th metering box on the i-th phase line at time t; , ,..., express time, time,..., The branch current of the intelligent measuring switch of the j-th metering box on the i-th phase line at time t; This represents the main line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; The branch impedance of the intelligent measurement switch of the j-th metering box on the i-th phase line; k represents the average number of sampling points per day.

[0010] Preferably, the main line current , ,..., Obtained based on the following formula: ; In the formula, k represents the average number of sampling points per day; Indicates the intelligent measurement switch A at time t. ij Main line current, intelligent measurement switch A ij This represents the intelligent measurement switch of the j-th metering box on the i-th phase line; g represents the intelligent measurement switch A. ij In phase and with daily average voltage greater than that of intelligent measurement switch A ij The g-th intelligent measurement switch A ig G indicates that the daily average voltage is greater than that of the intelligent measurement switch A. ij The total number of in-phase intelligent measurement switches; Indicates intelligent measurement switch A ij The average daily voltage; Indicates intelligent measurement switch A ig The average daily voltage; Indicates the intelligent measurement switch A at time t. ig The current; n represents the current of the intelligent measuring switch A. ij In phase and the daily average voltage does not exceed that of intelligent measurement switch A ij The nth intelligent measurement switch A in N indicates that the daily average voltage does not exceed the value of the intelligent measurement switch A. ij The total number of in-phase intelligent measurement switches; Indicates the intelligent measurement switch A at time t. in The current.

[0011] Preferably, the total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line is obtained based on the following formula; ; In the formula, This represents the total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; This represents the impedance of a 10kV system. This indicates the impedance of the 10kV busbar. This indicates the impedance of a 10kV / 0.4kV transformer. This represents the main line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; The branch impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line.

[0012] Preferably, the short-circuit instantaneous setting value and the short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line are obtained based on the following formula: ; ; ; In the formula, This represents the short-circuit protection current of the intelligent measuring switch of the j-th metering box on the i-th phase line; This represents the short-circuit instantaneous setting value of the intelligent measuring switch of the j-th metering box on the i-th phase line; Indicates the preset reliability coefficient; This represents the short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line.

[0013] Preferably, the above adaptive tuning method further includes the following steps: The overload long-delay setting value, short-circuit instantaneous setting value, and short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line are remotely sent to the intelligent measurement switch of the j-th metering box on the i-th phase line to achieve adaptive setting of the protection parameters of the intelligent measurement switch of the j-th metering box on the i-th phase line; wherein, the overload long-delay setting value, short-circuit instantaneous setting value, and short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line constitute the protection parameters of the intelligent measurement switch of the j-th metering box on the i-th phase line.

[0014] As can be seen from the above technical solution, compared with the prior art, the present invention discloses an adaptive setting method for the protection parameters of intelligent measuring switches in low-voltage distribution areas, which can realize remote online automatic setting of protection parameters, thereby reducing the cost of manual on-site setting, improving the efficiency of power grid operation and maintenance and the safety of users' electricity use. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 The flowchart illustrates an adaptive setting method for the protection parameters of an intelligent measuring switch in a low-voltage distribution area, as provided by this invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be noted that the A-phase, B-phase, and C-phase lines output from the low-voltage distribution area main meter are all led out to several metering boxes. Each metering box is equipped with a smart metering switch, and each metering box contains several user energy meters.

[0019] like Figure 1 As shown in the figure, this invention discloses an adaptive tuning method for the protection parameters of a low-voltage distribution area intelligent measuring switch, comprising the following steps: Establish the transformer-box-meter relationship for the low-voltage distribution area; In one or more embodiments, the transformer-box-meter relationship for the low-voltage distribution area is constructed based on the following steps: Obtain voltage curve data from the low-voltage distribution area master meter, individual user energy meters, and individual smart metering switches; The voltage curve data of the main meter and the voltage curve data of each smart metering switch are clustered using the adaptive density peak clustering method to obtain the transformer-box relationship of the low-voltage distribution area. The transformer-box relationship of the low-voltage substation area is tested and corrected using the adaptive k-nearest neighbor anomaly test method to obtain the corrected transformer-box relationship of the low-voltage substation area. The voltage curve data of the main meter and the voltage curve data of each user's electricity meter are clustered using the adaptive density peak clustering method to obtain the household-transformer relationship in the low-voltage distribution area. The household-transformer relationship in the low-voltage distribution area is tested and corrected using the adaptive k-nearest neighbor anomaly test method to obtain the corrected household-transformer relationship in the low-voltage distribution area. By integrating the corrected transformer-box relationship and the corrected household-transformer relationship of the low-voltage distribution area, the transformer-box-meter relationship of the low-voltage distribution area is obtained.

[0020] Calculate the rated total incoming current of the j-th metering box on the i-th phase line based on the aforementioned transformer-box-meter relationship, where i = A, B, C; j = 1, 2, ..., J. i J i This represents the total number of energy meters connected to the i-th phase line; In one or more embodiments, the rated total incoming current of the j-th metering box on the i-th phase line is obtained based on the following formula: ; In the formula, I N I represents the rated total incoming current of the j-th metering box on the i-th phase line; n N represents the rated current of the user's energy meter in the j-th metering box on the i-th phase line; N represents the number of user's energy meters in the j-th metering box on the i-th phase line; K represents the load simultaneity factor corresponding to N.

[0021] It is understood that the load simultaneity factor is obtained based on the load simultaneity factor table; Calculate the overload long-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line based on the rated total incoming current of the j-th metering box on the i-th phase line. In one or more embodiments, the overload long-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line is obtained based on the following steps: Determine the rated current range [I] min ,I max ]make Among them, [I] min ,I max = [63A, 80A], [80A, 100A], [100A, 125A], [125A, 160A], [160A, 250A], [250A, 315A], [315A, 400A], [400A, 500A], [500A, 630A], [630A, 700A] or [700A, 800A]; Rated current I min Rated current I max All of these indicate the rated current specification of the intelligent measuring switch; The rated current I max The overload long delay setting value is set to the intelligent measurement switch of the j-th metering box on the i-th phase line.

[0022] It is understandable that 63A, 80A, 100A, 125A, 160A, 250A, 315A, 400A, 500A, 630A, 700A, and 800A are the rated current specifications of the intelligent measurement switch.

[0023] Calculate the total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; In one or more embodiments, the total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line is obtained based on the following steps: Establish the voltage loop equations for the intelligent measuring switch of the j-th metering box on the i-th phase line: In one or more embodiments, the voltage loop equations are expressed as follows: ; In the formula, , ,..., In order to represent time, time,..., The voltage of the i-th phase line of the distribution transformer at any given moment; , ,..., In order to represent time, time,..., The voltage of the intelligent measuring switch of the j-th metering box on the i-th phase line at time t; , ,..., In order to represent time, time,..., The main line current of the intelligent measuring switch of the j-th metering box on the i-th phase line at time t; , ,..., express time, time,..., The branch current of the intelligent measuring switch of the j-th metering box on the i-th phase line at time t; This represents the main line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; The branch impedance of the intelligent measurement switch of the j-th metering box on the i-th phase line; k represents the average number of sampling points per day.

[0024] In one or more embodiments, the main current , ,..., Obtained based on the following formula: ; In the formula, k represents the average number of sampling points per day; Indicates the intelligent measurement switch A at time t. ij Main line current, intelligent measurement switch A ij This represents the intelligent measurement switch of the j-th metering box on the i-th phase line; g represents the intelligent measurement switch A. ij In phase and with daily average voltage greater than that of intelligent measurement switch A ij The g-th intelligent measurement switch A ig G indicates that the daily average voltage is greater than that of the intelligent measurement switch A. ij The total number of in-phase intelligent measurement switches; Indicates intelligent measurement switch A ij The average daily voltage; Indicates intelligent measurement switch A ig The average daily voltage; Indicates the intelligent measurement switch A at time t. ig The current; n represents the current of the intelligent measuring switch A. ij In phase and the daily average voltage does not exceed that of intelligent measurement switch A ij The nth intelligent measurement switch A inN indicates that the daily average voltage does not exceed the value of the intelligent measurement switch A. ij The total number of in-phase intelligent measurement switches; Indicates the intelligent measurement switch A at time t. in The current.

[0025] The voltage loop equations are fitted using a multivariate constrained linear regression analysis method to obtain the main line impedance and branch line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line. The total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line is obtained based on the main line impedance and branch line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line.

[0026] In one or more embodiments, the total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line is obtained based on the following formula; ; In the formula, This represents the total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; This represents the impedance of a 10kV system. This indicates the impedance of the 10kV busbar. This indicates the impedance of a 10kV / 0.4kV transformer. This represents the main line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; The branch impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line.

[0027] Calculate the short-circuit instantaneous setting value and short-circuit short-delay setting value of the intelligent measuring switch of the j-th metering box on the i-th phase line based on the total line impedance.

[0028] In one or more embodiments, the short-circuit instantaneous setting value and short-circuit short-delay setting value of the intelligent measuring switch of the j-th metering box on the i-th phase line are obtained based on the following formula: ; ; ; In the formula, This represents the short-circuit protection current of the intelligent measuring switch of the j-th metering box on the i-th phase line; This represents the short-circuit instantaneous setting value of the intelligent measuring switch of the j-th metering box on the i-th phase line; Indicates the preset reliability coefficient; This represents the short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line.

[0029] In one or more embodiments: The value is 1.1.

[0030] In one or more embodiments, the above adaptive tuning method further includes the following steps: The overload long-delay setting value, short-circuit instantaneous setting value, and short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line are remotely sent to the intelligent measurement switch of the j-th metering box on the i-th phase line to achieve adaptive setting of the protection parameters of the intelligent measurement switch of the j-th metering box on the i-th phase line; wherein, the overload long-delay setting value, short-circuit instantaneous setting value, and short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line constitute the protection parameters of the intelligent measurement switch of the j-th metering box on the i-th phase line.

[0031] Specifically: The overload long-delay setting value, short-circuit instantaneous setting value, and short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line are calculated at the remote master station. The remote master station sends these values ​​to the concentrator at the low-voltage distribution area's main meter via a 4G or 5G network. The concentrator at the low-voltage distribution area's main meter sends these values ​​to the intelligent measurement switch of the j-th metering box on the i-th phase line via HPLC and HRF, thereby enabling adaptive setting of the protection parameters of the intelligent measurement switch of the j-th metering box on the i-th phase line.

[0032] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An adaptive setting method for the protection parameters of an intelligent measuring switch in a low-voltage distribution area, characterized in that, Includes the following steps: Establish the transformer-box-meter relationship for the low-voltage distribution area; Calculate the rated total incoming current of the j-th metering box on the i-th phase line based on the aforementioned transformer-box-meter relationship, where i = A, B, C; j = 1, 2, ..., J. i J i This represents the total number of energy meters connected to the i-th phase line; Calculate the overload long-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line based on the rated total incoming current of the j-th metering box on the i-th phase line. Calculate the total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; Calculate the short-circuit instantaneous setting value and short-circuit short-delay setting value of the intelligent measuring switch of the j-th metering box on the i-th phase line based on the total line impedance.

2. The adaptive tuning method for the protection parameters of a low-voltage distribution area intelligent measuring switch according to claim 1, characterized in that, The transformer-box-meter relationship for the low-voltage distribution area is constructed based on the following steps: Obtain voltage curve data from the low-voltage distribution area master meter, individual user energy meters, and individual smart metering switches; The voltage curve data of the master meter and the voltage curve data of each smart metering switch are clustered using the adaptive density peak clustering method to obtain the transformer-box relationship of the low voltage distribution area. The transformer-box relationship of the low-voltage substation area is tested and corrected using the adaptive k-nearest neighbor anomaly test method to obtain the corrected transformer-box relationship of the low-voltage substation area. The voltage curve data of the main meter and the voltage curve data of each user's electricity meter are clustered using the adaptive density peak clustering method to obtain the household-transformer relationship in the low-voltage distribution area. The household-transformer relationship in the low-voltage distribution area is tested and corrected using the adaptive k-nearest neighbor anomaly test method to obtain the corrected household-transformer relationship in the low-voltage distribution area. By integrating the corrected transformer-box relationship and the corrected household-transformer relationship of the low-voltage distribution area, the transformer-box-meter relationship of the low-voltage distribution area is obtained.

3. The adaptive tuning method for the protection parameters of a low-voltage distribution area intelligent measuring switch according to claim 1, characterized in that, The rated total incoming current of the j-th metering box on the i-th phase line is obtained based on the following formula: ； In the formula, I N I represents the rated total incoming current of the j-th metering box on the i-th phase line; n N represents the rated current of the user's energy meter in the j-th metering box on the i-th phase line; N represents the number of user's energy meters in the j-th metering box on the i-th phase line; K represents the load simultaneity factor corresponding to N.

4. The adaptive tuning method for the protection parameters of a low-voltage distribution area intelligent measuring switch according to claim 3, characterized in that, The overload long-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line is obtained based on the following steps: Determine the rated current range [I] min ,I max ]make Among them, [I] min ,I max = [63A, 80A], [80A, 100A], [100A, 125A], [125A, 160A], [160A, 250A], [250A, 315A], [315A, 400A], [400A, 500A], [500A, 630A], [630A, 700A] or [700A, 800A]; Rated current I min Rated current I max All of these indicate the rated current specification of the intelligent measuring switch; The rated current I max The overload long delay setting value is set to the intelligent measurement switch of the j-th metering box on the i-th phase line.

5. The adaptive tuning method for the protection parameters of a low-voltage distribution area intelligent measuring switch according to claim 1, characterized in that, The total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line is obtained based on the following steps: Establish the voltage loop equations for the intelligent measuring switch of the j-th metering box on the i-th phase line: The voltage loop equations are fitted using a multivariate constrained linear regression analysis method to obtain the main line impedance and branch line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line. The total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line is obtained based on the main line impedance and branch line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line.

6. The adaptive tuning method for the protection parameters of a low-voltage distribution area intelligent measuring switch according to claim 5, characterized in that, The expression for the voltage loop equation set is: ； In the formula, , ,..., In order to represent time, time,..., The voltage of the i-th phase line of the distribution transformer at any given moment; , ,..., In order to represent time, time,..., The voltage of the intelligent measuring switch of the j-th metering box on the i-th phase line at time t; , ,..., In order to represent time, time,..., The main line current of the intelligent measuring switch of the j-th metering box on the i-th phase line at time t; , ,..., express time, time,..., The branch current of the intelligent measuring switch of the j-th metering box on the i-th phase line at time t; This represents the main line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; The branch impedance of the intelligent measurement switch of the j-th metering box on the i-th phase line; k represents the average number of sampling points per day.

7. The adaptive tuning method for the protection parameters of a low-voltage distribution area intelligent measuring switch according to claim 6, characterized in that, Main line current , ,..., Obtained based on the following formula: ； In the formula, k represents the average number of sampling points per day; Indicates the intelligent measurement switch A at time t. ij Main line current, intelligent measurement switch A ij This represents the intelligent measurement switch of the j-th metering box on the i-th phase line; g represents the intelligent measurement switch A. ij In phase and with daily average voltage greater than that of intelligent measurement switch A ij The g-th intelligent measurement switch A ig G indicates that the daily average voltage is greater than that of the intelligent measurement switch A. ij The total number of in-phase intelligent measurement switches; Indicates intelligent measurement switch A ij The average daily voltage; Indicates intelligent measurement switch A ig The average daily voltage; Indicates the intelligent measurement switch A at time t. ig The current; n represents the current of the intelligent measuring switch A. ij In phase and the daily average voltage does not exceed that of intelligent measurement switch A ij The nth intelligent measurement switch A in N indicates that the daily average voltage does not exceed the value of the intelligent measurement switch A. ij The total number of in-phase intelligent measurement switches; Indicates the intelligent measurement switch A at time t. in The current.

8. The adaptive tuning method for the protection parameters of a low-voltage distribution area intelligent measuring switch according to claim 7, characterized in that, The total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line is obtained based on the following formula; ； In the formula, This represents the total line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; This represents the impedance of a 10kV system. This indicates the impedance of the 10kV busbar. This indicates the impedance of a 10kV / 0.4kV transformer. This represents the main line impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line; The branch impedance of the intelligent measuring switch of the j-th metering box on the i-th phase line.

9. The adaptive tuning method for the protection parameters of a low-voltage distribution area intelligent measuring switch according to claim 8, characterized in that, The short-circuit instantaneous setting value and short-circuit short-delay setting value of the intelligent measuring switch of the j-th metering box on the i-th phase line are obtained based on the following formula: ； ； ； In the formula, This represents the short-circuit protection current of the intelligent measuring switch of the j-th metering box on the i-th phase line; This represents the short-circuit instantaneous setting value of the intelligent measuring switch of the j-th metering box on the i-th phase line; Indicates the preset reliability coefficient; This represents the short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line.

10. The adaptive tuning method for the protection parameters of a low-voltage distribution area intelligent measuring switch according to any one of claims 1-9, characterized in that, It also includes the following steps: The overload long-delay setting value, short-circuit instantaneous setting value, and short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line are remotely sent to the intelligent measurement switch of the j-th metering box on the i-th phase line to achieve adaptive setting of the protection parameters of the intelligent measurement switch of the j-th metering box on the i-th phase line; wherein, the overload long-delay setting value, short-circuit instantaneous setting value, and short-circuit short-delay setting value of the intelligent measurement switch of the j-th metering box on the i-th phase line constitute the protection parameters of the intelligent measurement switch of the j-th metering box on the i-th phase line.

Images